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To emphasize the importance of being cautious or vigilant about something.
在使用机器时，必须要注意安全操作。
When using the machine, you must pay attention to safe operation.
必须要注意天气变化，以免感冒。
You must pay attention to weather changes to avoid catching a cold.
Often used in instructions, warnings, or advice to highlight critical points.
In Chinese, ‘必须要注意’ is often followed by a noun or verb phrase indicating what requires attention. Example: ‘必须要注意安全’ (must pay attention to safety).
While ‘必须要注意’ is formal, in casual speech, ‘一定要注意’ or ‘千万要注意’ may be used instead.
组合词，由‘必须’（must）和‘要注意’（need to pay attention）构成，强调必要性。
常用于正式或劝告性语境，强调某事的重要性。可与‘务必’、‘一定’等副词连用以加强语气。